40400243 has 4 divisors (see below), whose sum is σ = 43507968. Its totient is φ = 37292520.

The previous prime is 40400237. The next prime is 40400249. The reversal of 40400243 is 34200404.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (40400237) and next prime (40400249).

It is a cyclic number.

It is not a de Polignac number, because 40400243 - 2¹⁴ = 40383859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40400249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553843 + ... + 1553868.

It is an arithmetic number, because the mean of its divisors is an integer number (10876992).

Almost surely, 2^40400243 is an apocalyptic number.

40400243 is a deficient number, since it is larger than the sum of its proper divisors (3107725).

40400243 is a wasteful number, since it uses less digits than its factorization.

40400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107724.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40400243 is about 6356.1185482966. The cubic root of 40400243 is about 343.1320822844.

Adding to 40400243 its reverse (34200404), we get a palindrome (74600647).

The spelling of 40400243 in words is "forty million, four hundred thousand, two hundred forty-three".